Re: Real-time hum removal

de Franklin 06/21/2006 11:40

>> Roger Bourne wrote:
>> > Hello all,
>> >
>> > When I use my computer mic to chat online or to record a sample
>> > opf my voice, or simply to record anything, I get a loud
>> > background hum (I suspect it the 60Hz power line is the culprit)
>> > . Is there any software/freeware that can filter the microphone
>> > input before it is received by chatting-software ? I suspect
>> > recording software will have a hum removal feature, however I am
>> > interested in real-time hum filtering for when I am chatting
>> > online. (The people on the receiving end of the chatting
>> > software -the ones who get the pleasure of hearing me ;)
>> > -complain that the hum is loud and distracting).
>> >
>> > Regards,
>> > Roger Bourne
>> >

> John wrote:
>>
>> Is the hum still there if you mute the mic input with the windows
>> audio panel controls?

On 21 Jun 2006, thunder7<thunder7@gmail.com> wrote:
>
> I had the same problem when I tried to hook up my PC to our Cables
> tv DVR so I could use my 5.1 surrond sound. Loud hum, I checked
> everything I replaced the drivers in my realtech sound card,
> checked the cables, bought new one's. At a loss I dissconnected
> from the DVR.
>
> Sigh it would have sound so good too.
>
> I just can not figure where the hmm was coming from, I even triend
> a ferrite core on the line in and out still did not work.

I agree with the Al's post to you. It sounds quite possible that this
could be an earth loop between the tv equipment and the PC.

Inhibitors like the one below are likely to have the audio line-
isolation transformers Al mentions plus a few passive components to
match the lines and minimize frequency losses.

http://www.radioshack.com/sm-see-all-needs-and-wants--pi-2062214.html

"Solving the humming problems of computer soundcards and home theatre
systems" may be of use to you.
<http://www.epanorama.net/documents/groundloop/home_solving.html>